જયારે \(0.1\) \( m\) લાંબા તારને સમાંતર \(5\) \(V\) નો વિદ્યુતસ્થિતિમાનનો તફાવત લગાવવામાં આવે છે,ત્યારે ઇલેકટ્રોનની ડિફ્રટ ઝડપ \(2.5 \times 10^{-4}\) \(ms^{-1}\) જેટલી મળે છે.જો તારમાં ઇલેકટ્રોનની ઘનતા \(8 \times 10^{28}\) \(m^{-3}\) હોય,તો તારના દ્રવ્યની અવરોધકતા ________ ની નજીક હશે.

A \(1.6 \times 10^{-7} \) \(Ω m\)
B \(1.6 \times 10^{-5} \) \(Ω m\)
C \(1.6 \times 10^{-3} \) \(Ωm\)
D \(1.6 \times 10^{-8} \) \(Ωm\)

Verified Solution

Answer & Solution

Correct Answer

(B) \(1.6 \times 10^{-5} \) \(Ω m\)

Step-by-step Solution

Detailed explanation

\(V=I R=\left(n e A v_{d}\right) \rho \frac{\ell}{A}\) \(\therefore \quad \rho=\frac{\mathrm{V}}{\mathrm{V}_{\mathrm{d}} \mathrm{lne}}\) Here \(\mathrm{V}=\) potential difference \(\mathrm{I}=\) length of wire \(\mathrm{n}=\mathrm{no} .\) of electrons per unit volume of…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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